I'm trying to create a small tool for copying blend shape data from one shape to another using python and I've got it working, but I'm trying to make the process completely automated. The only thing that wont work is using python to import a .iff attribute map using an existing file. This is what isn't working:

Not sure exactly your required methodology, but I use this opensource tool. It works perfectly for copying blends from one mesh to another and you can write some python wrappers to do the whole thing for you. Or rewrite to make better for yourself